Dynamo-electric machine



(No Model.)

DE WITT B. BRAGE.

DYNAMO ELECTRIC MACHINE.

No. 427,294. Patented May 6, 1890.

' UNIT D STATES DE WITT B. BRACE, OF LINCOLN, NEBRASKA.

DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No.

427,294, dated May 6, 1890.

Application filed March 3, 1890. Serial No. 34:2,423. (N0 model.)

To all whom it may concern:

Be it known that 1, DE WITT B. BRACE, a citizen of theUnited States, residing at Lincoln, in the county of Lancaster and State of Nebraska, have invented a new and useful Dynamo-Electric and Electro-Dynaniic Machine, of which the following is a specification.

This invention relates to that class of machines such as are described in the specification to Patent N 0. 421,47 9, granted me in the year 1890. In such machines the field-mag nets and armature proper are fixed and cornmutators and brushes maybe dispensed with, and the necessary induction in the armaturecoils is produced by rotating iron masses in front of the projections of the field-magnet which form the cores of the armature-coils. In such machines the magnetic circuit between successive pairs of poles is closed successively by magnetizable masses moving in a plane perpendicular to the magnetic force between the fixed pairs of the polar projections of the field-magnet.

In my present invention I attain the same end by a laminated cylindrical magnetizable mass having polar projections moving about an axis within laminated field-masses of iron having polar projections extending within, which may be wound with armature-coils, and which, when being successively in juxtaposition with the polar projections of the inner cylinder by rotation of the latter, are successively magnetized.

In this invention the lines of force enter the sides of the cylinder and pass through it in planes perpendicular to the axis of rotation. It is evident that when the proj ections of the outer and inner masses are radially in line a maximum number of lines of force will pass through the coils surrounding the outer projeotions and that a minimum number of lines of force will pass through the coils inclosing the projections within the cylinder. It is further evident that when the cylinder is rotated the magnetic circuit is made to pass successively through adjacent armature-coils, which form the different branches into which the main circuit divides, thus producing corresponding inductions in each armature-coil.

minimum It is also evident that the direction of the lines of force within these coils is not changed, but only the number and intensity varied.

The annexed drawings will show some of the forms for attaining these ends.

In Figs. 1, 2, and 3, B B is the inner cylindrical laminated mass, with polar projections b I), carried by the shaft S.

A A is the outer laminated mass, with the inner polar projections (l d, which form the cores of the armature-coils c c.

In Figs. 1 and 2, C O are the magnetizingcoils inclosing the inner cylinder,which forms the cores of these coils, within which the main magnetic circuit passes, and branching through the polar projections b b c a into the outer shell A A.

In Fig. 3,0 0 are the magnetizing-coils of the cores D D, within which the main magnetic circuit passes, branching through the polar projections c 0 Z) 1) into the rotating cylinder B B and out again into the shell A A. It is evident that when a polar projection 12 b is radially in line with a proj ection' d (Z a maxim um number of lines of force will pass through the coilc c, inclosing the core d d, and that a number of lines of force will pass through any coil 0 0 whose core (Z (Z is not covered by a projection 12 I). hen the cylinder is rotated,the projection b b will pass successively in front of the projections d (I, thus making and breaking alternately the magnetic circuit through each coil, which will thus induce an electro-motive force and corresponding current in alternate directions successively.

The number of branches into which the main magnetic circuit divides is arbitrary, but in general must consist of two, at leasti. 6., two pairs of polar projections, one on each side of the neutral plane which separates the surfaces of opposite polarity. In Figs. 1, 2, and 3 the main circuit divides into six branches, three of which are shown open and three closed.

The number of polar projections of the innor cylinder, which may cover an outer polar projection, need not be limited to one, but may be more, nor need an inner projection cover only one outer projection, but it may cover more. An armature-coil need not surround a single outer polar projection, but may surround more.

It is evident that there may be one or more field-magnets or outer magnetizable masses and that they may be excited in any way de sired and may be of any suitable form which will allow of there being on each side of the neutral plane pairs of polar projections, through which the magnetic circuit maybe alternately switched across the'neutral plane.

To obtain the best effect, the space between the inner and outer polar projections should be as narrow as possible and the channel between the adjacent'pairs of the inner projections should be of suificient depth to break the magnetic circuit effectively.

It is evident that the application of the principle in this type of machines may be used for the generation of an electric current,

or it maybe used under proper conditions for the production of mechanical energy as an electro-dynamic machine or motor.

The form and arrangement and number of parts are not to be restricted to those described and illustrated, but may be varied with the attainment of the same ends; but

WVhat I claim, and desire to secure by Letters Patent, is

l. The combination, in a dynamo-electric and electro-dynamic machine, of a moving cylindrical magnetizable mass having polar projections within a fixed magnetizable mass or between fixed field-magnets having two or more opposing pairs of fixed polar projections wound, one or more, with armature-coils, r0- tating about an axis and in a plane parallel to the magnetic lines of force between opposing poles and successively closing the magnetic circuit through successive projections.

2. The combination of a laminated iron cylinder built up of fluted disks or rings, insulated from one another within or between fixed laminated field-masses, with polarizing coils having laminated polar projections wound, one 01' more, with armature-coils, 1'0- tating in a plane parallel to the lines of magnetic force between the polarized field-masses and successively circuitin g the magnetic force through successive armature'coils.

G. 0. ST. JOHN, FRED E. Mooxnrrr. 

